Post-training AI Engineer & Researcher, xAI

• Expert in ML and fine-tuning large language models
• Track record in leading research that significantly impacts AI advancement
• Experience in data-driven large language model behavior improvements
• Experience in advanced reinforcement learning or inference-time search techniques
• Experience in developing benchmarks or large-scale distributed machine learning systems
• Experience in model optimizations under complex setups (e.g., multi-modality, multi-context, multi-agent, long-horizon tasks, diverse user preference/feedback)

• The post-training team at xAI transforms powerful pre-trained models to become steerable, versatile, and capable of understanding and addressing real-world challenges
• As a post-training researcher/engineer, you will enhance the model's instruction-following capability and general usefulness to fulfill our mission – developing AI systems that can accurately understand the universe, create new knowledge, and improve themselves through interactions
• Creating and driving research agenda to advance model quality
• Improving data mixtures by building data collection pipelines and developing data generation techniques
• Creating generalizable reward models and developing novel reinforcement learning algorithms
• Designing and implementing robust model evaluations
• Designing and implementing large-scale model training frameworks
• Collaborating with pre-training, reasoning, data, multimodal, applied, product efforts to push the frontiers of model capability

• After submitting your application, the team reviews your CV and statement of exceptional work
• If your application passes this stage, you will be invited to a 15-minute interview (“phone interview”) during which a member of our team will ask some basic questions
• If you clear the initial phone interview, you will enter the main process, which consists of four technical interviews:
• Coding assessment in a language of your choice
• 2 x post-training technical sessions: These sessions will be testing your ability to formulate, design and solve concrete problems in post-training. It can be research or engineering, depending on background/experience
• Meet the Team: Present your past exceptional work and your vision with xAI to a small audience
• Our goal is to finish the main process within one week. We don’t rely on recruiters for assessments. Every application is reviewed by a member of our technical team. All interviews will be conducted via Google Meet

• Health and wellness: Comprehensive health insurance including medical, dental, vision, and disability coverage
• Life and family: Life and AD&D insurance and fertility benefits to ensure our team’s well-being and peace of mind
• Flexible vacation: We work hard but avoid burn out. Take time off when you need it
• Visa sponsorship: We support international talent with visa sponsorship to join our team
• 401(k) plan: Retirement savings plan to secure your financial future

Total funding: $12.1bn

xAI is Elon Musk's venture into the world of artificial intelligence, and like all things Musk, it's going big. Its setting out to build AI that helps humanity understand the universe and its starting with Grok, its conversational AI chatbot already integrated into X (formerly Twitter). With access to real-time data and a powerful ecosystem of Musk-led companies, xAI is certainly pushing towards artificial general intelligence at serious scale.